Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session Z12: Mini-symposium B: Pentaquarks and Other Exotics II |
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Chair: Simon Capstick, Florida State University Room: Marriott Tampa Waterside Room 11 |
Tuesday, April 19, 2005 3:30PM - 3:42PM |
Z12.00001: Search for the Theta(1540) Pentaquark in Electro-Production with the BaBar Detector Jonathon Coleman Since early in 2003, several experiments have presented evidence for the existence of a positive strangeness baryon state of mass around 1540 $MeV/c^2$ and width $< 8$ MeV, the Theta(1540), which decays to $K^+ n$ and $K^0 p$. Such a state has minimum quark content u d u d sbar and consequently has been interpreted as the S = +1 member of the anti-decouplet of pentaquark states proposed by Diakonov et al. Six of the claimed observations involve real or virtual photoproduction. We present preliminary results from a search for the production of the Theta(1540) in $e^+ e^-$ interactions (i.e. virtual photoproduction) in the Be beampipe of the BaBar Detector at the PEP-II Collider. Event selection procedures are summarised and $K^0_S$ p invariant mass distributions in the threshold region are presented. [Preview Abstract] |
Tuesday, April 19, 2005 3:42PM - 3:54PM |
Z12.00002: Searches for exotic particles in d+Au collisions at $\sqrt{s_{_{NN}}}=200$~GeV and Au+Au collisions at $\sqrt{s_{_{NN}}}=62.4$~GeV Jingguo Ma Exotic particles such as pentaquark states and di-baryons are allowed to exist within the framework of Quantum Chromo Dynamics (QCD). Several experiments reported the evidence for the existence of a pentaquark state, $\Theta^{+}(uudd\bar{s})$, however, several other experiments reported null results. We present results on the search of pentaquark states in d+Au collisions at $\sqrt{s_{_{NN}}} = 200$~GeV and Au+Au collisions at $\sqrt{s_{_{NN}}}=62.4$~GeV from the STAR experiment at RHIC. Statistical significance of our searches will be discussed. [Preview Abstract] |
Tuesday, April 19, 2005 3:54PM - 4:06PM |
Z12.00003: Constraints on narrow exotic states from K+p and K0$_{Lp}$ scattering data Ron Workman, Richard Arndt, Igor Strakovsky, Mark Manley, J. Tulpan We consider the effect of exotic S=+1 resonances Theta+ and Theta++ on K+p elastic scattering data (total cross section) and the process K0$_{Lp}$--$>$K0$_{Sp}$. Data near the observed Theta+ (1540) are examined for evidence of additional states. The width limit for a Theta++ state is reconsidered. [Preview Abstract] |
Tuesday, April 19, 2005 4:06PM - 4:18PM |
Z12.00004: All-Charm Tetraquarks James Vary, Richard Lloyd, John Spence We report on the possibility of all-charm tetraquark states bound with respect to breakup threshold into mesons with the same quark and total angular momentum content. We use a set of Hamiltonians tuned to fit the charmonia spectroscopy and employ recently developed many-body methods that are free of spurious center-of-mass motion effects. Global color symmetry is guaranteed for all solutions. We extend results reported recently (1) by using more realistic Hamiltonians (2) and carrying out renormalization procedures to reduce truncation effects. The renormalization procedures are adapted from the successful ab-initio no-core shell model (3). This work was supported in part by a USDOE grant DE-FG02-87ER-40371. \begin{enumerate} \item R. Lloyd and J.P. Vary, Phys. Rev. D 70, 014009 (2004). \item J.R. Spence and J.P. Vary, Phys. Rev. C 59, 1762 (1999); and to be published. \item P. Navratil, J. P. Vary and B.R. Barrett, Phys. Rev. Lett. 84, 5728 (2000); Phys. Rev. C 62, 054311 (2000). \end{enumerate} [Preview Abstract] |
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